Tapping attachment



Aug. 26, 1924. 1,506,367 G. w. EMRICK TAPPING ATMCHMENT Filed June 23, 3922 I 51m/vento@ @ewige 14./ mz'ck 33M. his @bho/maagd.

Patented Aug. 26, 1924.

UNITED STATES PATENT OFFICE.

GEORG-E W. EMR-IGK, OF BROOKLYN, NFH/V YORK, ASSIGNOR TO EASTERN TUBE AND TOOL COMPANY, A CORPORATION OF NEVI YORK.

TAPPING ATTACHMENT.

Application led June 23, 1922.

T 0 all ccf/wm t may concern.'

Be it known that I, GEORGE 157. EMRIGK, a citizen of the United States, and residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and useful mprovements in Tapping Attachments, of which the following is a specification, such as will enable those skilled in the art to which it appertains to make and use the same.

This invention relates to tapping attachments for use in connection with drill presses and similar machines, and the object of the invention is to provide means whereby a tap mounted in connection with the attachment may be automatically rotated in one direction in the operation of cutting the threads; a further object being to provide means for permitting of the slipping of the driving means for said tap in the event of the tap striking an obstruction or the like to prevent the breaking of the tap; a further object being to provide means for automatically reversing the direction of rotating the tap in the operation of withdrawing the tap from a predetermined workpiece, both of said driving means involving a floating double face cone clutch device adapted to be moved into and out of engagement with oppositely and positively rotated conical drive members and also capable of slippage over said members when the tool is subjected to excess stress or strain, and with these and other objects in view the invention consists r in a device of the class and for the purpose specified which is simple and compact in construction, efficient in use and which is constructed and operated as hereinafter described and claimed.

The invention is fully disclosed in the following specification, of which the accompanying drawing forms a part, in which the separate parts of my improvement are designated by suitable reference characters in each of the views, and in which Fig. 1 is a partial transverse sectional view through my improved tapping attachment and showing the parts in one position of 0peration Fig. 2 a view similar to Fig. 1 but showing parts in another position;

Fig. 3 a sectional plan view on the line 3-3 of Fig. 1;

Fig. t a partial section on the line 1 -4 of Fig. 1; and', y

Serial No. 570,466.

Fig. 5 a section on the line 5 5 of Fig. 4 and on an enlarged scale.

ln practice, a substantially cup-shaped casing 5 is employed, said casing being provided with an extension 6 at one side thereof, and the casing 5 and extension 6 are open at the top and adapted to be closed by a cover 7 held in position by screws 8, and at one side of the extension 6 is a projecting boss 9 in connection with which a rod 10 may be connected to facilitate the mounting and handling of the attachment.

Approximately centrally of the bottom of the casing 5 is a bearing portion 11 in which is mounted a brass or bronze bushing 12, and the cover 7 is provided with a similar bearing 18 provided with a bushing 14 and a tapered shaft 15 by means of which the attachment may be mounted in connection with a suitable machine is provided with a threaded portion 16 adapted to be threaded into a sleeve extension 17 of the shaft 18 which extends into the casing 5, said sleeve extension 17 operating in the bushing 14. rThe shaft 15 is provided with a flange 15a and the shaft 18 with a flange 18 which retain both of the shafts 15 and 1.8 against vertical movement in the casing.

rllhe supplemental shaft 18 extends downwardly into a sleeve 19 which forms a guide for the lower end of the supplemental shaft 18, and the sleeve 19 is mounted in the bushing 12 and the upper or inner end thereof is guided by the supplemental shaft 18. The

upper or inner end of the sleeve 19 is threaded as shown at 2O to receive a ringshaped lock nut 21, which is permanently set when placed in position and serves to hold a conical friction clutch 22 in position on the sleeve 19, said sleeve being provided with a fiange 23 upon which the cone rests, and the nut 21 limits the upward movement of the clutch 22 on said sleeve. The top plate 24 of the clutch 22 is provided around the sleeve 19 with notches 25 and the flange 23 is provided with similar notches 26 arranged at right angles to the notches 25, and a iioating ring-shaped member 27 is mounted-between the top plate 2d of the clutch 22 and the flange 23, and the member 27 is providedon opposite sides with projecting members .1 28 and 29 which are adapted to operate in. connection with the notches 25 and 26 re-g spectively to interlock thesleeve 19, with the; clutch 22 and Iyet per n ai,t.` Q-f the ,radial move/f.-

ment of theclutch 22 on the sleeve in practically any direction thus facilitating the centering of the clutch as hereinaftei set out.

The clutch 22%is provided with inner and outer Ifibrous facin'gsl30 and 31, and the inner facing 30 is adapted to, opera-te in connection with a conical member 32 rotatably mounted upon the sleeve 19 and provided with a gear face 33, and the cuter facing 31 is adapted to operate in connection with another conical member 34 which is fixed to the flange 18a of the shaft 18 byscrews 35 to form an integral part thereof, and the member' .34 isVV provided withv a large gear 36 which is intheffoim of a ring secured to the Ameiniber 34.

Int'the extension 6 ofthe casing 5 and centrally thereof is mounted avertical pin or ,bearing 37 upon whichv is mounted within' 'the casing 5, or theext'ension' 6 thereof, a

' sleeve'38' the upper end'V of which` is provided with,agear 39 which meshes with the i' lgea ""36'a1idthelower 'end of said sleeve is "proyidedwith' a gear 40, whichmeshes with la. 'piiiioii41 mounted centrallybetween the pin 37 and `the sleeve 19 on a suitable pin or other bearing, andthe pinion 41 is adapted to mesh with the gear 33 on the member 32.

The' sleeve 19 isprovided at its lower end with aft'apered pin extension 42 in connec- 1tion with which a suitable chuck43 is adapt* ed to'be mounted, whereby a tap or similar tool 44 may be connected with the sleeve 19 and the frictioln cone clutch'22 coupled therewith i I From`v the foregoing description it will be A 'apparent that-the tapered shaft 1,5 is connec'ted with a suita-blemachine in the usual manner and is rotated by the'operative mechanisms of the machine, and the rotation of thisvshaft 4will'correspondingly rotate the Vmember 34 and the gear 36 mounted thereon,

which'operation will rotate the sleeve 3S and the gears v39 and ('40 tlieieof,/an`d the conical member 3,2 will also be rotated through the gears 41 and 33 which are in operative connection with the Vgear 40, and this gearing will' rotate the member 34 in one direction and the ,member 32 in the opposite dii'ection and the conical clutchjmember 22 is adapted to Kbe moved into ,and out of engagement with the separate members 32 and 34 to, control 'the direction of l rotation of the tool 44 mounted in the ychuck 43,

Normally rtheA iclutch member -22 is in engagem'ent with the conical 'member 32 and fin'the 'operation ofdtapping a hole in a suitableworkpiece,when the tool or 'tap'44 comes 'j in entact 'with'tl'ie 'wrkpiece,'"the pressure .f "ai on willl orcetheconicalclutch member Zupwardiy 'to and'in this operation and in the event of the tool striking an obstruction, or in the event of the presence of undue stress or strain on the tool, and by reason of the` taper employed on the clutch. member 22 and member 34 a slippage is allowed between said members thus preventing or avoiding the breaking of the tool 44. After the hole in the workpiece has been threaded and in withdrawing or removing` the tool from the workpiece, the conical clutch member 22 or the friction facing- 30 thereof, is moved into engagement with the. member 32 and the, tool is rotated in the opposite direction in this operation, and the same slippage is provided in the opei'ationvof removing the tool, or in the-reverse rotation thereof. lIt will also be apparent thatby reason of the method of coupling the conical clutch member with the sleeve 19 through the floating ring 27 regardless ofany unevenness, bulges, depressions `or the4 like ineither of the friction facings (3031,

said friction facings will :tind a seat in or on the members ,34 and '32, it being understood that the conical clutch member is capable4 of radial. movement in every direction by reason of what might be called a uni versal Oldham coupling between said clutch member and the sleeve 19 in connection with which t-he tool is mounted.

It will also be apparent that I provide suitable means for oiling the various working` parts of my improved device, and by reason of the mounting of the clutch member 22, within and between the separate members 32 and 34, no oil used for lubricating purposes can come in contact with the friction facings 30-31 of the clutch member thus keeping?,` such friction facings in proper condition at all times, and while I have shown certain details of construction for carrying my invention into eitect, it will be understool that various changes therein and iiiodiiications" thereof may be made, within the scope of the appended clain'is, without departing `from the spirit of my invention or sacriiicber, and a universal mounting forisaid Clutch to facilitate the centering thereofyin connection with the separate ineinbers.

2. A device of the class described comprising two `rotatable 'conical members, one

' ofsaid-membersbeing located withinthe,

other, means for rotating said'membrs in xllS 1' in yclutch i of said members being located within the other, means for rotating said members in opposite directions, a floating clutch mounted between the conical faces of said members and capable of movementtoward and from the conical face of either member, a universal mounting for said clutch to facilitate the centering thereof in conneet-ion with the separate members, said clutch being provided on its inner and outer faces with clutch facings adapted to operate in connection with the separate conical members, and the taper of said conical members and said clutch being such as to permit slippage of the clutch on said members.

t. A device of the class described comprising two rotatable yconical members, one of said members being located within the other, means for rotating said members in opposite directions, a floating clutch mounted between the conical faces of said .members and capable of movement toward and from the conical face of either member, a universal mounting for said clutch to facilitate the centering thereof in connection with the separate members, said clutch being provided on its inner and outer faces with clutch facings adapted to operate in connection with the separate conical members, the taper of said conical members and said clutch being such 'as to permit slippage of the clutch on said members, and means for coupling a tool in connection with said clutch.

5. A tapping attachment of the class described comprising a suitable casing, a conical member rotatably mounted in said casing and provided with an extension adapted to be connected with a suitable power unit whereby said member may be rotated, another conicaly member mounted in said casing and within said first named member and geared in connection with said first named member in such manner as to rotate in a direction opposite to that of said first named member, a clutch mounted between said members and provided with friction facings adapted to operate in connection with the conical faces of either of said members, Iand said clutch being provided with a movable mounting to permit of its centering upon the facings of the separate members.

6. A tapping attachment of the class described comprising a suitable casing, a conical member rotatably mounted in said casing and provided with an extension adapted to be connected with a suitable power unit whereby said member may be rotated, another conical member mounted in said casing and within said first named member and geared in connection, with said first named member in such manner as to rotate in a direction opposite to that of said first named member, a clutch mounted between said members and provided with friction facings adapted to operate in connection with the conical faces of either of said members, a shaft member extending through the casing and in connection withwhich said clutch is mounted, and means to provide radial movement on said shaft member.

7. A tapping attachment of the class described comprising a suitable casing, a conical member rotatably mounted in said casing and provided with an extension adapted to be connected with a suitable power unit whereby said member may be rotated, another conical member mounted in said casing and within said first named member and geared in connection with said first named member in such manner as to rotate in a direction opposite to that of said first named member, a clutch mounted bet-Ween said members and provided with friction facings adapted to operate in connection with the conical faces of either of said members, a shaft member extending through the casing and in connection. with which said clutch is mounted, means to provide radial movement of the clutch on said shaft member, and means whereby a suitable tool may be mounted in connection with said shaft member.

8. A tapping attachment of the class described comprising a substantially cupshaped casing provided at one end with an extension, said casing being open at the top and provided with a detachable cover, a conical member mounted in connection with the cover of the casing and rotatable therein and provided with an extension by means of which said member may be rotated, another conical member mounted in the casing and within said first named member a gear unit mounted within the extension of the casing and provided with gear members in operative connection with the separate conical members whereby said conical members may be rotated in opposite direction, and a clutch member mounted in said casing between the conical faces of said members.

9. A tapping attachment of the class described comprising a substantially cupshaped casing provided at one end with an extension, said casing being open at the top and provided with a detachable cover, a conical member mounted in connection with the cover of the casing and rotatable therein and provided with an extension by means of which said member may be rotated, another conical member mounted in the casing and within said first named member, a gear unit mounted within the extension of the casing and provided with gear members in operative connection with the separate conical members whereby said conical members may be rotated `in opposite direction, a

clutch member mounted in said casing be tween the conical faces of said members, a shaft extending through the bottom of the casing, and means for movably mounting said clutch in connection with said shaft to permit of the radial movement of said clutch thereon. i

10. A tapping attachment of the class described comprising a substantially cupshaped casing provided at one end with an extension, said casing being open at the top and provided with a detachable cover, a conical member mounted in connection with the cover of the casing and rotatable therein and provided an extension by ,means of which said member may be rotated, another conical member mounted in the casing and within said first named member, a gear unit mounted within the extension of the casing' and provided with gear members in operative connection with the separate conical members whereby said conical members may be rotated in opposite direction, a clutch' member mounted in said casing between the4 conical faces of said members, a shaftextending through the bottom of the casing, means for movably mounting said clutch in connection with said shaft to permit of the radial movement of said clutch thereon, and said clutch and shaft being capable of vertical movement in the casing to permit of the movement of said clutch into and out of engagement with the separate members,

11. A tapping attachment of the class described comprising a substantially cupshaped casing provided at one end with an extension, said casing being open at the top and provided with a detachable cover, a conical membermounted in connection with the cover of the casing and rotatable therein and provided with an extension by means of which said member may be rotated, another conical member mounted in the casrate conical members whereby saidv conicalmembers may be rotated in opposite direction, a clutch member mounted in said casing between the conical faces of saidv members, a shaft extending through the bottom of the casing, means for movably mounting' said clutch in connection with said shaft to permit of the "radial movement of said clutch thereon, said clutch and shaft being capable of vertical movement in the casing to permit of the movement of said clutch into and out of engagement with the' separate members, and means for mounting a too-l in connection with said shaft.

12. A tapping attachment ofthe class described comprising a substantially vcupshaped casing provided at one end with an eX- tension, said casing being open at t-he top and provided with a detachable cover, a conical member mounted in connection with. the cover of the casing and rotatable therein and provided with an extension by means of which said member may be rotated, another conical member mounted in the casing and wit-hin said first named member, a gear unit mounted within the extension of the cas-- ing and provided with gear members in operative connection withthe separate conical members wherebysaid conical members may be rotated in opposite direction, a clutch member mounted in said casing between the conical faces of said members, a shaft ertending through the bottom of the casino', means for movably mounting said clutch in connection with said shaft to permit of the radial movement of said clutch thereon, said clutch and shaft being capable of vertical movement in the casing to permit of the movement of said clutch into and out of engagement with the separate members, means for mounting a tool' in connection with said shaft, and said clutch member being provided with inner and outer clutch facings adapted to operate in connection with the tapered faces of said conical members. f

In' testimony that I claim the foregoing as my invention I have signed my name this 21st day of June, 1922.

Girone-n w. rivieren.

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